Notes

The Safari Zone entrance has a hidden Nugget outside the bounds of the map, hinting that it was possibly a different map at an earlier point in development. (credits to Raven Freak, Pokémon Red disassembly team)

Similarly, glitch map 0x6F has a hidden Max Elixer even though the map is not valid, again hinting that it was possibly an intended map at an earlier point in development. (credits to Stag019)

There are invisible PCs in the Safari Zone rest houses with the same coordinates (credits to Stag019)